Machine for applying tacking strips to multiple piece wooden cores



Oct 26, 1954 w. J. MILLER ET AL MACHINE FOR APPLYING TACKING STRIPS TOMULTIPLE PIECE WOODEN CORES 4 Sheets-Sheet 1 Filed Aug. 9 1950 INVENTOR5 14 170007 JMl/ler a) BY .fl/frea' 6. J'obnson Oct. 26, 1 w. J.MILLER ET AL MACHINE FOR APPLYING TACKING STRIPS TO MULTIPLE PIECEWOODEN CORES 4 Sheets-Sheet 2 Filed Aug. 9, 1950 Oct, 26, 1954 w: J.MILLER ETAL MACHINE FOR APPLYING TACKING STRIPS TO MULTIPLE PIECE WOODENCORES Filed Aug. 9 1950 INVENTORS 21 7/1222? JIM/War BY fl/fred 6',db/mson 1954 w. J. MILLER ETAL MACHINE FOR APPLYING TACKING STRIPS TOMULTIPLE PIECE WOODEN CORES Filed Aug. 9. 1950 4 Sheets-Sheet 4INVENTORS MY/fam J Mil/er t I a M-" a 9 2 M m M /M I 7 m r o. R 3 I m 9m I II 4 .1 0 T2 3 4 :2 I a 1% 2 4 7 fli m z a L/ I, 8 I M 3 w t O m H 5U :6 2 E HM a 0 PL K we I a u 2 m. A5 Q 52 1. mm r. 3 w w m n w J C. m.w

C, WM flTTO/PNE'Y Patented Oct. 26, 1954 MACHINE FOR APPLYING TACKINGSTRIPS TO MULTIPLE PIECE WOODEN CORES William J. Miller and Alfred C.Johnson, Seattle, Wash, assignors to Elliott Bay Mill 00., Seattle,Wash, a corporation of Washington Application August 9, 1950, Serial N0. 178,478

5 Claims. 1

This invention relates to a core glue taoker of a type designed tofasten together a plurality of pieces of wood or like material so thatthey may be readily handled and used as a core or center ply to whichsheets of veneer or like facing material may be glued.

If a core of medial ply of a veneer panel is made up of a plurality ofpieces of wood of substantial thickness which are edge glued togetherthen unequal stresses are liable to be set up in the core to such anextent as to cause warping or twisting of the finished panel. Inaccordance with this invention the several pieces used in a core are notedge glued together but are left free so that each piece may function asan individual structural member and cumulative stresses in the core areavoided.

An object of this invention is to provide a simple and efiicient machinefor use in connection with cores which are made up of a plurality of istrips or pieces of wood or like material and in which the severalpieces which are used to make up each core are tacked together so thatthe core can be handled as a unit in the processes of manufacture but inwhich the several core pieces are not edge or face glued together butare left free to function as individual strips or pieces in finishedpanels which are made by gluing surface sheets, such as wood veneer, tosaid strips or core pieces. This provides a panel in which warping, dueto internal stresses is eliminated.

Another object of this invention is to provide a machine which will tackand temporarily secure together a plurality of pieces of material bygluing or adhesively securing to said core pieces a plurality of stripsof thin cotton gauze of sufiicient strength to hold the pieces togetherwhile the cores are being handled in the processes of manufacture butwhich will break apart readily if they are subjected to substantialtension, as when panels using the cores are placed in a press to cureand set the glue after surface veneers have been applied to the cores.

Another object is to provide a core glue tacking machine for tackingtogether assembled pieces of material to form cores, which comprisestrack means to support the cores, pressure and heating shoes above thetrack means to hold the assembled core pieces in proper alignment and tocure the glue on tacking strips which are laid on the cores, means atthe infeed end of the machine to facilitate assembly of the cores, meansto push the assembled cores through the machine and means at the outfeedend portion of the machine to facilitate removal and stacking of thefinished cores.

Other objects of the invention are to provide a machine which is simplein construction, easy to operate and one which will facilitate rapid andeconomical production of tacked together cores which are to be used inmaking up veneered articles.

Other objects of the invention will be apparent from the followingdescription taken in connection with the accompanying drawings.

In the drawings:

Figure 1 is a plan view of a core glue tacker constructed in accordancewith this invention.

Fig. 2 is a side elevation of the same looking in the direction ofbroken line 2-2 of Fig. 1.

Fig. 3 is a view partly in elevation and partly in section takensubstantially on broken line 33 of Fig. 1.

Figs. 4 and 5 are end elevations respectively looking in the directionsof broken lines i i and 5-5 of Fig. 1 and on a larger scale than Fig. 1.

Fig. 6 is a detached View, partly in section and partly in elevation,taken substantially on broken line 6-4; of Fig. 1 and showing one of thecross shafts from which a plurality of pressure and heating shoes areadjustably and floatingly supported.

Fig. '7 is a view partly in section and partly in elevation showing aglue applicator for applying glue to a gauze strip and showing pressuremeans for applying pressure to the forward end portions of shoes underwhich cores pass.

Fig. 8 is a fragmentary view partly in plan and partly in section, takensubstantially on broken line 8-8 of Fig. 3, and on a larger scale thanFig. 3 and showing parts of the stacking carriage at the discharge endof the machine.

Fig. 9 is a detached sectional view on a larger scale than the otherviews showing parts of the pressure and heating shoe devices.

Fig. 10 is a detached fragmentary view, partly in elevation and partlyin section, showing pressure and heating shoe suspending and supportingmeans.

Fig. 11 is a detached perspective vi w showing a pressure shoe extensionmember.

Fig. 12 is a fragmentary plan view showing a core of a type to whichtacking strips may be applied by the use of this machine.

Fig. 13 is a sectional view through said core, taken substantially onbroken line i3l3 of Fig. 12 and on a larger scale than Fig. 12.

Fig. 14 is a detached perspective view of one of the shorter spacerblocks used in the core shown in Figs. 12 and 13.

Fig. 15 is a wiring diagram showing electrical control means used inconnection with the machine.

Like reference numerals designate like parts throughout the severalviews.

This machine comprises a frame which includes upright leg members 2ll,transverse frame bars 2| and longitudinally extending frame bars 22, allof which may be formed of structural steel.

Preferably three sets of the longitudinal frame bars 22 are provided,one at each side of the machine and one set substantially midway betweenthe two sides of the machine. Three plane fiat track plates 23, 24 and25 are supported on and secured to the three respective sets oflongitudinal frame bars 22. These track plates extend longitudinally ofthe machine in transversely spaced apart parallel relation to each otherand serve as supports for material which is being fed through themachine.

The frame bars 22 and track plates 23, 24 and 25 overhang at the intakeend portion of the machine, shown at the left in Figs. 1, 2 and 3, sothat they form a feed table at which operators can work in assemblingcores. This feed or work table is designated generally by 29. The coreswhich are laid up on the feed table 29 pass through the machine and aretacked together so they can be handled as units rather than asindividual pieces.

Three longitudinally extending electrically heated pressure and heatingshoes, indicated generally by numerals 26, 21 and 28, are positionedabove the respective track plates 23, 24 and 25 and cooperate with thesaid track plates to receive and hold therebetween the pieces of coreforming material which are being fed through the machine.

Each electrically heated shoe, 26, 2'! and 23, see Figs. 1, 2, 3, 6 and10, comprises two horizontally spaced apart parallel metal side membersat between which a metal heater plate 3| is disposed. Each heater plate3| carries a plurality of strip type electric heating elements 32disposed in end to end relation on the top side of the heater plate. Thelowermost surface of each heater plate 3 l is elevated a short distanceabove the plane of the lower edges of the two side members 30 betweenwhich it is disposed.

This prevents the heater plates 3| from contacting and riding on gauzetacking strips 33, Figs.

'7 and l2, which are used to temporarily secure together the strips orpieces of material of which the cores are made.

One way of supporting the heater plates 3| is to suspend them by. means.of bolts 34, Fig. 10,

which pass through cross bars and are threaded into the plates 3|. Thecross bars 35 rest on the top edge portions of the shoe members 30 andcan be secured to members 30 by screws 36.

All of the pressure shoe 26, 21. and 28 are floatingly supported fromtwo cross shafts 31 and 38, by inclined lever arms 39. The lever arms 39which support the medial pressure shoe 2? have hubs which rotativelyreceive the shafts 3 1 and 38, see Fig. 6. These medial lever arms 39are prevented from moving longitudinally of the shafts 31 and 33by setcollars 4|. The lever arms 39 which support the two lateral pressureshoes 26 and 28 have internally threaded rotatable hubs 42which-interfit threaded portions of the shafts 3! and 33 so thatrotation of the hubs 42 will transversely adjust said hubs 42 and thelever arms 39 and pressure shoes 26 and 28-1which are. supported by saidarms The 4 shafts 37 and 38 are non-rotatively supported by the frame ofthe machine. Preferably the thread on shafts 37 and 38 are right handthreads adjacent one side of the machine and left hand threads adjacentthe other side of the machine. When the shafts are thus threaded it willbe apparent that rotation of all of the hub members 42 in one directionwill move the two pressure shoes 26 and 28 toward each other androtation of all of said hub members in an opposite direction will movesaid two pressure and heating shoes 26 and 23 away from each other. Themedial pressure shoe 2"! usually does not need to be transverselyadjusted but it can, if necessary, be transversely adjusted byadjustment of the set collars 4|.

Preferably the threaded hubs 42 extend rotatively through the lever arms39 and have sprocket wheels 43 secured thereto. The two sprocket wheels43 adjacent the pressure shoe 26 are connected with each other by a linkbelt 44 and the two other sprocket wheels 43 adjacent the pressure shoe28v are similarly connected with each other by a sprocket chain or linkbelt 45. These link belt connections insure equal transverse adjustmentin either direction of the two end portions of each of the respectiveshoes 26 and 28. Thus the pressure and heating shoes 26, 2,1 and 28 arealways maintained parallel. The link belts 44 and 45 may be operated totransversely adjust the pressure shoes 26 and 28 bymanually grasping andmoving said link belts. Obviously either shoe 26 or 28 may beindependently adjusted or moved in either direction.

An adjusting screw 46, Fig. 9, is used to provide, between each leverarm 39 and an adjacent portion of the pressure shoe with which the leverarm 39 is connected, a suspension means which will limit the downwardmovement toward the adjacent track of the pressure and heating shoe but.will permit said shoe to be moved upwardly. This is accomplished byhaving each adjusting screw 46 rotatively and slidably disposed in ayoke 4.1 which is pivotally supported by the adjacent lever arms 39 andthreaded into another yoke 48 which is pivotally connected with theadjacent side members 30 of a pressure and heating shoe.

A glue and gauze dispensing unit designated generally by 56 is mountedon the forward end portion of each pressure and heating shoe. Theseunits 5|}:are more fully hereinafter described.

Pneumatic means, see Fig. 7, for exerting a down pressure, on theforward end portion of each shoe 26, 21' and 28 is positioned adjacentto and just beyond each glue and gauze dispensing unit '50, as respectsthe, direction of travel of the coresv in the machine. Each pneumaticpressure means comprises an air tight diaphragm housing 5|. having aflexible diaphragm 52, therein. A downwardly extending piston rod 53 issecured to each diaphragm 52 and is arranged to exert a pressure, asthrough cross plate means 54, on the. forward end portion of theadjacent pressure anclheating. shoe. Air under pressure is supplied toeach housingthrough conduit means 55. An electrically actuated valve isprovided in the conduit means 55 to control the supply of compressedairto and the exhaust of compressed air from the diaphragm housings 5|as hereinafter explainedin connection with thewiring diagram shown inFig. 15, This air control means is synchronized with the operation ofthe machine.

and is controlled by an operator at the forward end of the machine.

The pneumatic devices described in the preceeding paragraph yieldinglyurge the forward end portions of the floatingly supported shoes 26, 21and 28 downwardly onto the cores when the cores are stopped and notmoving in the machine but do not exert downward pressure when the coresare being moved, as hereinafter explained. The weight of the shoes 25,2'5 and 28 always rests on the cores and the shoes are thus urgeddownwardly by gravity onto the cores at all times.

Each glue and gauze dispenser, as best shown in Fig. '7, comprises aglue receptacle 55 secured by bracket means 51 to the forward endportion of a pressure shoe. A roll of strip gauze 33 is supported on areel 58. This gauze is diagrammatically shown in Fig. '7 and thethickness of the same is essentially much exaggerated in this showing.This gauze is a thin cloth mesh through which the glue will freely passand which is so thin it will not cause any appreciable bulging of afacing sheet which is later applied to a core over this gauze. The gauzeextends downwardly from the reel 58 into the glue receptacle 56 andunder and around a large applicator roll '60, thence upwardly and out ofthe glue receptacle 56 between two wringer rolls and 62. From thewringer rolls 5! and 62 the gauze 33 extends downwardly under and arounda small applicator roll 63 which is rotatively mounted between the twoside members 30 of an adjacent shoe. The wringer rolls BI and 62 removeexcess glue from the gauze 33 and the applicator roll 63 presses androlls the gauze down onto the core material which is passing under saidapplicator roll 63. The strip of gauze 33 is thus adhered to the coresor core material and moves with the same and the gauze is positionedbetween the two side members 30 of the shoes and does not extend underthe lower edge portions of the side members 30. The lower edge portionsof the side members 30 ride on the core material and hold the same levelbut do not ride on the gauze strips. The gauze strips 33 are in closeproximity to the heating plates 3! as they progress through the machineby intermittent advance movements and the heat from the heating elements32 is conducted through the plates 31 and cures the glue while the coresare being advanced step by step through the machine.

One satisfactory way of supplying cores to the machine is to manuallyassemble such cores on the feed table 29 at the head end of the machine.

One type of core satisfactory for making a veneer panel suitable for useas an inside door is shown in Figs. 12 and 13 and it will be understoodthat core forming stock may be assembled in many other forms. Scraplumber and heart stock can be used to advantage in making up the coresthus conserving wood and holding down construction costs.

The rectangular core shown in Figs. 12 and 13 comprises two side stiles65, a plurality of relatively narrow, spaced apart, longitudinal slatsor strips 56, a plurality of relatively short spacer blocks 67 and aplurality of longer spacer blocks or strips 68. These members 65, 66, 67and 68 are all of equal thickness from face to face of the core and areassembled in the manner shown in Figs. 12 and 13 to provide a core ofuniform thickness. The core forming material, as illustrated in Fig. 12is continuous and solid across both ends of the core and across themedial portion of the same. Thus three places are provided at which 6,the core maybe tacked by the use of the gauzestrips 33. Obviously thismachine may be constructed and operated so that it will tack a panel atmore than three locations or at less than three locations. The positionsin which one tacking strip is applied near the end of the core and onesubstantially mid way of the length of the core are shown in Fig. 12 andit will be understood that the end portion of the core which is brokenaway in Fig. 12 is similar to the end thereof which is shown.

Preferably each of the blocks 61 and 68 have edge grooves 69 provided inboth edges thereof to insure ventilation within the finished panel. Alsolarge air spaces are provided within the panel between the slats 66except at the locations of the spacer blocks 67 and 63. This provides ahollow panel which is well adapted to serve as a door for inside use.The longer blocks 53 provide substantial bodies at the locations wheredoor locks and latches are ordinarily installed.

The panels or cores are laid up or assembled on the feed table with oneend portion of the core abutting a fixed line up bar in and with thetrailing edge portion of the panel abutting or positioned against amovable feed bar 1!. The feed bar H and line up bar Iii are at rightangles to each other and help facilitate a proper squaring up of thepieces which go to make up the core.

Movement of the feed bar H to the right, as respects the showing inFigs. 1, 2 and 3, will advance a previously laid up core into a positionbetween the pressure and heating shoes 26, 27 and 28 and the trackplates 23, 24 and 25. Also it Will, at the same time, push and feedforward all of the cores or core stock in the machine in advance of thecore which is being introduced. This will bring the core near thedischarge end of the machine into a position for discharge, ashereinafter explained. The gauze strips 33 are laid down continuously onthe cores and these gauze strips have to be out along the trailing edgeof a core before the core can be removed from the discharge end portionof the machine.

The means herein disclosed for moving the feed bar H comprises two rackbars 712 secured to the feed bar H and extending toward the dischargeend of the machine and positioned alongside of the inner edge portionsof the two track plates 23 and 25 respectively. The rack bars 72 aresuitably guided for longitudinal movement and have downwardly directedrack teeth which engage or mesh with pinions 13 on a cross shaft 14. Thecross shaft 74 has a driving connection by means of a sprocket wheel 15,link belt it and sprocket pinion '11 with a revel-sable electric motor18. Speed reduction gear means may be incorporated into the constructionof the motor '13.

After a core has been laid up on the table 2:? and before movement ofthe core toward the pressure shoes is instituted two slidably disposedpressure shoe extension members 19, Figs. 2 and 11, are manually pulledout and laid on the core adjacent the respective end portions of saidcore to serve as hold down members for the pieces of material in thecore while said core is being moved under the pressure and heating shoes23, 21 and 28. The pressure shoe extension members l9 fit slidably overthe shoes 23 and 28 beneath the ends of the brackets 57, Fig. 2, andrest on the cores at all time when cores are in the machine. The members79 are thus held in alignment with the shoes 25 and 2S and. will movewith the incoming core as it is advanced into the machine. After a newcore has been laid aesaeca 7. the members 19 are manually drawnoutwardly. in prolongation of the shoes 26 and. 27 and rest on the newcore but are not entirely disengaged from the shoes 26 and- 21. One ofvthe'pressure shoe extension members 19 is diagrammatically shown in Fig.2 by dot and dash linesin aposition similar to the position it wouldoccupy. when first pulled out on a core and before feeding-movement ofthe core had. been started; A- similar member 19 is shown in perspectivein Fig. 11*. These pressure shoe extension members 19 straddle the twopressure and heating shoes 2ft and 28 at the respective sides of themachine and are guided by saidshoes 26'and 28 and'the weight of thesemembers 19 helps to prevent upward bulging of the assembled parts of thecores during their initial movement and before they are under thepressure and heating shoes. Preferably hand hold meanslQ' is provided onthe for.- ward end portion of each extension member 79; Downwardpressure on the forward end portions of the shoes 25, 21 and 28, by thepneumatic means is released while a core is being moved into the machinebut the incoming coreis pushing or advancing all of the other cores-inthe machine and for this reason it is desirable to provide the extensionmembers 19 toserve as weights and hold down the assembled pieces in thecore which is being introduced. The extension members move inwardly withthe new core and remain in an inward position straddling the shoes 26and 28 while the next core is being laid After the pressure shoeextension members 19 have been properly positioned on a laid up core aswitch so at the forward end of the machine, see Fig. 15, is manuallyactuated. Movement of this switch 80 will first break a circuit to avalve control relay 8]. This circuit is formed in part by conductors 82and 83. The breaking ofthe circuit to relay 8| will actuate said relay8! in such a manner as to cause it to admit current from a source 84 toa coil 88. This will position a valve 85, see also Figs. 1 and 2, so asto shut off the supply of air under pressure through air conduit means55' to the three diaphragm housings and willopen these housings toexhaust. The relief of pressure in diaphragm housingslil relieves thedownward pressure on the forward end portions of the pressure andheating shoes 26, 21 and 28 and makes it possible to feed afreshly laidup core under said shoes andto advance the cores which are already undersaid shoes. Further movement of switch 80 will close a circuit to thereversing starter mechanism 8? of the motor 18. This will energize themotor 78 and institute movement of the feed bar H and advance all of thecores in the machine toward the discharge end of the machine. The

switch 80 will return to its initial position assoon as it is released.When the feed bar H- reaches a position far enough to the right, asrespects the showing in Fig. 2, a trip-arm 88 on said feed bar H willengage with and operate a limit switch 89. The operation of the limitswitch 89 will reverse the motor 18 and will close a circuit by way ofthe switch BB'to the valve controlled relay 8|. This will operate valve85 and disconnect the diaphragm housings Slas respects exhaust andconnect said'housings 5!:

with a supply of air under pressure. Thuspressure will'be applied to theforwardend portions of the pressure and heating shoes at substan tiallythe same time advance movement-of the cores in the machineis-stopped.The reversing:

8. of the motor 18 will quickly'returnt the feed bar H to its startingposition, in whichit is shown in Eigshl', 2. and: 3.

As the feed bar H nears its starting position onv its return stroke thetrip arm 88 will engage with and operate another limit switch 9B andstop the motor '18-. Electric current of suitable voltage forthe-operation of the motor 18 is suppliedby way'of conductors 91.

Two manually operated emergency switches 92 and 93. are connected withthe reversing starter means 81' of the motor 18 by circuit meansincluding conductor 94. These emergency switches are positioned atopposite ends of the machine and make it possible for operators ateither end of the machine-to instantly stop the motor 18 in case of anemergency.

Preferably the electric heaters 32 are supplied with electric current bycircuit means independent of the above described control circuit means.

The core stock in the machine will be advanced one step each time afreshly assembled core is fedin and will then remain stationary untilanother core has been made ready. This provides intermittent. feeding ofthe cores. Applicants have found that the glue can be satisfactorilycured if each. core is allowed about three minutestime under thepressure and heating shoes and that: the machine can be conveniently fedat about this rate.

Eachtime a new core is fed into the machine asimilar. core on which theglue has been cured will be. discharged. Adjustable stacking carriagemechanism is provided to facilitate removal of the cores from themachine and is shown at the right in Figs. 1, 2 and. 3. Also thisstacking mechanism is shown in Figs. 5 and 8. Preferably this adjustablestacking mechanism is slidably supported on two pairsof. horizontaltrack bars IUD disposed at opposite sidesof the machine. The two bars.109 of each pair are vertically spaced apart, areparallel, are rigidlysecured. to the main irameof the machine and extendhorizontally outwardfrom the discharge end portion of the machine.

Two parallel, spaced. apart, upright carriage trackmembers lfl2'areadjustably supportedfrom the track bars I00 at opposite sides of themachine. Each upright carriage track member I02 is herein shown to be aflat metal bar or plate which is slidably supported on the horizontaltrack bars by bracket means H13. Each upright carriage track member 102carries an upright counterweight housing IU'I which is securedto themember I02. by horizontal bars N25. The counterweight housings aregenerally rectangular. in cross'section and are hollow and preferablyhave slots m l-longitudinally disposed in their inner sides.

Theupper bracket means H13 of each carriage track I02 has a horizontalside bar I06 rigidly secured thereto. Each side bar Hi6 extends parallelto the adjacent track bar lDB toward the front end of the machine andpast the adjacent counterweight guide Hll. A tie bar I61 extendscrosswise of the machine and has its respective end portions connectedby short upright bars I08 with theforward end portions of the side barsI06. Two skid plates we are secured to the tie bar I01 and extend towardthe forward end of the machine. Two rack bars HG are secured tothelowermost: sides of the skid plates I09 and to the tie bar I01 andextend beyond the forward endsof saidskid p1ates-and engage withgearwheels or pinions I I I by which they may be moved to adjust thestacking carriage toward or away from the discharge end of the frame.The pinions III are secured to a transverse shaft H2 which may bemanually turned by a handwheel II3 to adjust the position of thestacking carriage. The skid plates I09 serve as supports for thedischarging cores after the cores have passed beyond the ends of thetrack plates 23, 2 3 and 25.

Two vertically movable carriage units each comprising a carriage plateII 4 and a plurality of grooved rollers I I5 are mounted on the uprightcarriage tracks I 82. The two carriage plates H4 at opposite sides ofthe stacking carriage are connected with each other by two spacedapartparallel transverse rods H6. Two core supporting plates II'I ofangle shaped cross section are each provided with two guide tubes flitwhich are slidably disposed on the guide rods H8. The core supportingplates ii! serve to receive and support the cores and to lower saidcores onto a core stack on any suitable transfer means by which thecores can be taken away.

Two shifter bars I28 and I2I respectively are pivotally connected withthe two core supporting plates II! and extend toward each other. Theadjacent end portions of the two shifter bars I28 and I2I are pivotallyconnected with a shifter lever I22. The lever I22 is mounted on a fixedpivot I23 which is positioned between the points of connection of thetwo shifter bars I22 and I2: with said lever 122. A plate I24 is rigidlysecured. to the transverse rods I I 6 and supports the pivot member I23.Obviously angular movement of the lever I22 will move the two coresupporting plates III toward and away from each other and this makes itpossible to release a core after the core has been lowered onto a stackof cores.

Preferably each shifter bar IN and 525 is of two part construction withthe two parts thereof overlapped and adjustably connected together as bybolts I25 operating its slots I26. This makes it possible to adjust thelength of the shifter bars I 20 and I2! so as to take care of cores ofdifferent length.

Also preferably a latch member I2l, Fig. 3, is pivotally mounted on oneof the upright track bars I E32 and is adapted to engage with acooperating part I28 on the adjacent carriage plate to hold thevertically movable parts of the stacking carriage in a raised positionafter they have been raised to receive a core. The latch member I2! willautomatically engage with the part I28 as the carriage moves upwardlyand must be manually released in order to lower the stacking carriage.

Each carriage plate H4 is connected with a counterweight I32 as by alink belt lsi which passes over a sprocket wheel I32. Each sprocketwheel E32 is secured to a cross shaft I33 which is rotatively supportedfrom the upper end portions of the track bars its by bearing bracketmeans I34. The sprocket wheels I32 are both secured to the shaft I33 andthus equal and parallel up and down movement of the carriage means atopposite sides of the stacking carriage is insured. The counterweightsI39 are movably disposed in the housings Illl.

In the operation of the stacking carriage said carriage is adjustedlongitudinally of the machine on the track bars Inn to properly positionit to receive cores of the predetermined width which are being fed tothe machine. In this connection it will be understood that the width ofcores which are being tacked may be varied from time to time and thatthe stacking carriage means must be correspondingly adjusted along thetrack bars I00. Each time the carriage means is raised the L-shapedlowering brackets H8 will stop with the horizontal flanges thereof flushwith the track members I23, I24 and I25 and flush with the skid platesI09. Each time the cores in the machine are advanced a tacked togethercore will be pushed beyond and clear of the skid plates I09 and tie barIt? and onto the L-shaped lowering brackets II'I. When a core is thuspushed onto the lowering brackets IIi it will be connected with the nextadjacent core by the continuous gauze strips 33 and the trailing edge ofthe discharging core will be positioned substantially flush with theends of the skid plates I89 which are attached to the tie bar IG'I. Anoperator standing at the discharge end of the machine will cut the threestrips of gauze between the discharging core and the next adjacent core.He will then unlatch the latch member I21, lower the brackets Ill andcore supported thereby onto a transfer means or onto a stack of coreswhich rests on a transfer means and then move the lever I22 to spreadthe brackets II8 apart and release the core. The lowering carriagemeans, including the brackets Ill, will then be returned to the elevatedposition, as shown in Fig. 3, preparatory to receiving the next core. Itwill be noted that this lowering carriage means is shown in a loweredposition in Fig. 5.

The operation of this machine may be summarized as follows:

Suitable pieces of material from which cores are to be made are laid orassembled on the work table at the forward end of the machine. As fastas these cores are made up they are fed, by the feed bar I I, under thepressure and heating shoes 26, 2'! and 28. This process is continuousbut the movement of the cores is intermittent and these cores are pushedthrough the machine step by step. Each time a freshly assembled core ispushed under the pressure and heating shoes a core on which the glue iscured is pushed out from under said shoes and onto the stackingmechanism at the discharge end of the machine. Each discharging core ismanually cut loose from the next core therebehind and is removed fromthe machine.

The foregoing description and accompanying drawings clearly disclosepreferred embodiments of this invention but it will be understood thatchanges may be made within the scope of the claims.

We claim:

1. In a core glue tacker for tacking together assembled pieces ofmaterial to form a core, track means to support the core; a plurality ofrelatively long straight pressure and heating shoes positioned inadjacent parallel opposed spaced relation over said track means, eachpressure shoe comprising two transversely spaced apart parallel pressureplates having spaced apart core engaging lower edge portions and havingheating means positioned between said pressure plates and above thecommon plane of said core engaging lower edge portions; glue applicatortacking strip supply means positioned adjacent to the forward endportions of said shoes; and core feedin means operable to feed corespast said glue applicator and tacking strip supply means and betweensaid shoes and said track means, whereby freshly glued tacking stripswill he applied to said cores and will pass between the spaced apartpressure plates of each shoe below '11 and clear of the heating meansinthe shoe and the glue on said tacking strips will be cured by the heatfrom said heating means.

2. In a core glue tacker for tacking together assembled pieces ofmaterial to form a core, track means to support a core; a plurality ofrelatively long straight pressure and heating shoes positioned inadjacent parallel opposed spaced relation over said track means; linkmeans floatingly supporting said shoes adjacent to and above said trackmeans, whereby said shoes will rest by gravity on cores when "cores arebetween said shoes and said track means; valve controlled pneumaticmeans connected with the forward end portions of said shoes, wherebydownward pressure may be exerted by said pneumatic means on the forwardend portions of said shoes; glue applicator tacking strip supply meanspositioned adjacent to the forward end portions of said shoes; andreciprocable core feeding pusher bar means positioned to engage withcores and push said cores past said glue applicator and tacking stripsupply means and between said shoes and said track means, wherebyfreshly glued tacking strips will be applied to said cores and the glueon said tacking strips will be cured by heat from said shoes.

3. In a core glue tacker for tacking together assembled pieces ofmaterial to form cores, track means to support cores; a plurality ofrelatively long straight pressure and heating shoes floatingly supportedin adjacent parallel opposed spaced relation above said track means;glue applicator tacking strip supply means positioned adjacent theforward end portion of each of said shoes adapted to dispense a tackingstrip through a bath of glue; valve controlled releasable pneumaticpressure means connected with the forward end portions of the respectiveshoes adapted to yieldingly urge said forward end portions of said shoestoward said track means; and core feeding means operable to feed corespast said glue applicator and tacking strip supply means and betweensaid shoes and said track means, whereby freshly glued tacking stripswill be applied to said cores and the glue on said tacking strips willbe cured by the heat from said shoes.

4. In a core glue tacker for tacking together assembled pieces ofmaterial to form cores, core supporting track means; a plurality ofrelatively long straight pressure and heating shoes floatingly supportedin adjacent parallel opposed spaced relation above said track means;glue applicator tacking strip supply means positioned adjacent theforward end portion of each of said shoes adapted to dispense a tackingstrip through a bath of glue; a tacking strip roller carried by theforward end portion of each shoe and positioned to roll on a tackingstrip which is passing under the shoe; a releasable pneumatic pressuredevice operatively connected with the forward end portion of each shoeadjacent the tacking strip :roller which is carried by the shoe adaptedto yieldingly urge the forward end portion .of the shoe downwardlytoward the track means, the shoes throughout their entire length beingcontinuously urged by gravity against cores positioned thereunderirrespective of the operation of said pneumatic means; and core feedingmeans operable to feed cores past said glue applicator and tacking stripsupply means and between said shoes andsaid track means, whereby saidrollers-will apply freshly glued tacking strips to the cores and theglue on said tacking strips will be cured by heat from said shoes.

5. In a core glue tacker for tacking together assembled pieces ofmaterial to form cores, a frame; horizontal track means on said frame toslidably receive cores; a plurality of relatively long straight pressureand heating shoes floatingly supported above said frame in adjacentparallel opposed spaced relation to said track means; said shoesterminating a substantial distance from the forward end of said trackmeans to provide at the forward end of said frame a feed and assemblytable; glue applicator tacking strip supply means positioned adjacentthe forward end portion of each of said shoes adapted to dispense atacking strip through a bath of glue; a reciprocable core feeding pusherbar disposed on said feed and assembly table and adapted to bepositioned at the forward end of said table whereby cores may beassembled on the table in front of the bar; straight heavy extensionshoes slidably fitting over the forward end portions of the pressure andheating shoes and movable into extended positions onto assembled coresto hold down the parts of said cores while the cores are being fed intothe spaces between the shoes and the track means; and pusher bar movingmeans connected with said bar adapted to move said bar and push corespast said glue applicator and tacking strip supply means and betweensaid shoes and said track means.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 894,017 Krebs July 21, 1903 915,504 Sutter Mar. 16, 1909921,618 Murdoch May 11, 1909 1,646,645 Frederickson et al. Oct. 25, 19271,702,185 Weber Feb. 12, 1929 1,958,845 Burns May 15, 1934 2,228,887Peterson Jan. 14, 1941 2,371,331 Irwin et al Mar. 13, 1945 2,407,070Frame 1. Sept. 3, 946 2,453,185 Bilhuber Nov. 9, 1948 2,488,759 BollingNov. 22, 1949 FOREIGN PATENTS Number Country Date 509,377 Germany Oct.8. 1930

